First of all, there are alternative methods of determining your true IP address. The best method of hiding is to use a live CD distribution called "TAILS." You can find it online at https://tails.boum.org
Just realize there are still methods of finding you.
If you read and understand the information on the TAILS site, you will see that a live CD with TOR embedded is a better method than using an operating system installed on a hard drive.
Good luck and stay legal & safe.